Question

Resolva as equações incompletas abaixo:
A) (x + 2) (x - 16) + ( x + 7) ( x + 7) = 89
B) ( x - 2) (x - 2) + (x + 3) = 4
C) x^2 - 8x = 0
D) x^2 - 25 = 0

Answer 1

A)x^2-16x+2x-32+(x+7)^2=89
x^2-16x+2x-32+x^2+14x+49=89
2x^2+0+17=89
2x^2+17=89
2x^2=89-17
2x^2=72
x= -6
x= 6

B)(x-2)^2+x+3=4
x^3-4x+4+x+3=4
×^2-4x+x+3=0
x^2-3x+3=0
x= - ( - 3)+-raiz (-3)^2-4×1×3
___________________
2 ×1
x=3+--raiz9-12
____________
2
x= 3+- raiz - 3
__________
2


C)x (x-8)=0
x=0
x-8=0
x=0
x=8

D)x^2=25
x= -5
x=5

Espero ter ajudado